Symmetrix Drilling Tools with Casing Tube

Release time：2013-12-19

1.When the drilling starts,the central bit drive the ring bits down to the hole,meanwhile the casing shoe and casing tube follow down together.
2.When arriving the bed rock,reversely rotate the tools and the central bit is pulled out from the hole.
The next step is the difference between Retrievable and Permanent:
Retrievable:During pouring the concretes through the casing tube,pull out the casing tube with the ring bit synchroly.
Permanent:Pour the concretes into the casing tube or do the next construction work.

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